Create functionalities.md

doc/functionalities.md

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+# Functionalities
+
+---
+
+This plugin allows users to create multiple carts for their own use.
+
+After adding products to the first cart and viewing it, logged-in user has the possibility to add a new cart.
+
+<div align="center">
+    <img src="./images/multicart_single.png"/>
+</div>
+
+After creating it, user can switch between and view the contents of all created carts.
+
+<div align="center">
+    <img src="./images/multicart_multiple.png"/>
+</div>
+
+It is also possible to switch between carts in every shop view using mini cart.
+
+<div align="center">
+    <img src="./images/multicart_switch.png"/>
+</div>